A student has to do the experiment on finding the focal length of a given concave mirror by using a distant object. Out of the following 'set-ups' A, B, C and D available to him:
A : a screen, a mirror holder and a scale
B : a mirror holder, a screen holder and a scale
C : a screen holder and a scale
D : a mirror holder and a scale

The 'set-up' which is likely to give him the best result is :
(1) A
(2) B
(3) C
(4) D

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Solution

To obtain the focal length of a concave mirror, the student needs to form an image of a distant object on a screen using the given mirror and then calculating the distance of the screen from the pole of the mirror. So, he will need a screen, a mirror holder and a scale along with the mirror given.

Hence, the correct answer is option 1.

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